A phenomenological fracture condition is proposed for ortho tropic brittle materials. It contains nine material parameters and can account for widely differing compressive and tensile strengths in ...

The Brittle Strength of Orthotropic Materials

: Some of the environmental factors which affect the structural performance of composite materials are discussed. Various possible mechanisms of environmental factors are examined, together with relevant experimental data. Finally, an analytical approach for predicting environmental effects, based on rate theory, is considered.

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Effects of Environmental Factors on Composite Materials.

It is 100 years since the well-know Mohr-Coulomb strength theory was established in 1900. A considerable amount of theoretical and experimental research on strength theory of materials under complex stress state was done in the 20th Century. This review article presents a survey of the advances in strength theory (yield criteria, failure criterion, etc) of materials (including matellic materials, rock, soil, concrete, ice, iron, polymers, energetic material, etc) under complex stress, discusses the relationship among various criteria, and gives a method of choosing a reasonable failure criterion for applications in research and engineering. Three series of strength theories, the unified yield criterion, the unified strength theory, and others are summarized. This review article contains 1163 references regarding the strength theories. This review also includes a biref discussion of the computational implementation of the strength theories and multi-axial fatigue.

Advances in strength theories for materials under complex stress state in the 20th Century

Analytical/Computational models for the fused deposition (FD) material stiffness and strength as a function of mesostructural parameters are developed. Effective elastic moduli are obtained using the strength of materials approach and an elasticity approach based on the asymptotic theory of homogenization. Theoretical predictions for unidirectional FD‐acrylonitrile butadiene styrene materials are validated with experimentally determined values of moduli and strength. For moduli predictions, the results were found to be satisfactory with difference between experimental and theoretical values of less than 10 percent in most cases.

Mechanical behavior of acrylonitrile butadiene styrene fused deposition materials modeling

This paper reviews the existing theories of failure of laminated fiber-reinforced composite materials. The failure theories of isotropic materials are also reviewed. There exist at least 30 failure theories for laminated composites. Some of these theories are applied directly to the laminate while the rest of the theories are applied to the individual layers of the laminate. In addition, the paper reviews the theories of the post-failure behavior of laminated composites, that is, the behavior of laminated composites beyond first ply failure. For this analysis there exist at least twelve theories, which are included in this survey.

Survey of Failure and Post-Failure Theories of Laminated Fiber-Renforced Composites

Strength of anisotropic composite materials subjected to any state of combined stress, predicted from basic strength characteristics of unidirectional layer

V. D. Azzi

Papers

Anisotropic strength of composites